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D( x )
x+2 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-2) U (-2:+oo)
(2*x^4+5*x^2+5)/(x+2) = 0
(2*x^4+5*x^2+5)/(x+2) = 0 // * x+2
2*x^4+5*x^2+5 = 0
t_1 = x^2
2*t_1^2+5*t_1^1+5 = 0
2*t_1^2+5*t_1+5 = 0
DELTA = 5^2-(2*4*5)
DELTA = -15
DELTA < 0
x belongs to the empty set
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